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Pulse spectra for different cavity dispersions. The lengths of the Yb-PBG fiber and the standard single mode fiber are (a) 0.35 m and 1.0 m, (b) 0.35 m and 0.8 m, (c) 0.27 m and 0.47 m, respectively. Some asymmetry in the soliton pulse spectra can be expected for different values of cavity dispersion, as discussed in the text. The difference in noise floor between the curves is due to variations in the sensitivity level of the optical spectrum analyzer. It should be noted that spectra are offset arbitrarily in respect of Y-axis for clarity.